<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert title="注意：只允许为第三分类设置相关参数！" type="warning" :closable="false" show-icon> </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class='cat_opt'>
                <el-col>
                    <span>选择商品分类: </span>
                    <!-- 选择商品分类的级联选择框 -->
                     <el-cascader class='cat_cascader'
                        v-model="selectedCateKeys"
                        :options="catelist"
                        expand-trigger= "hover"
                        :props= "cateProps"
                        @change="cateListChange"
                        ></el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleClick">
            <el-tab-pane label="动态参数" name="many">
                <!-- 添加参数的按钮 -->
                 <el-button type="success" :disabled='isBtnDisabled' @click="dialogbox= true">添加参数</el-button>
                 <!-- 动态参数表格 -->
                   <el-table
                    :data= "manyTableData"
                    border
                    stripe
                    >
                       <!-- 展开行 -->
                     <el-table-column
                    type="expand">
                    <!-- 用作用域插槽进行获取数据
                     -->
                     <template slot-scope="scope">
                         <!-- 循环渲染Tag标签 -->
                         <el-tag v-for= "(item, i) in scope.row.attr_vals" :key="i" closable @close='handleClose(i,scope.row) '>{{itemgti}}</el-tag>
                         <!-- 输入的文本框 -->
                         <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                            </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                     </template>
                    </el-table-column>
                    <el-table-column
                    type="index">
                    </el-table-column>
                    <el-table-column prop= "attr_name"
                        label="参数名称">
                    </el-table-column>
                    <el-table-column
                        label="操作">
                          <!-- eslint-disable-next-line -->
                        <template slot-scope="scope" >
                            <el-button type="primary" icon="el-icon-edit" @click= "showdialogVisible(scope.row.attr_id)">编辑</el-button>
                            <el-button type="primary" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                    </el-table>
            </el-tab-pane>
            <el-tab-pane label="静态属性" name="only">
                 <el-button type="success" :disabled='isBtnDisabled' @click="dialogbox = true">添加属性</el-button>
                 <!-- 静态属性表格 -->
                   <el-table
                    :data= "onlyTableData"
                    border
                    stripe
                    >
                    <!-- 展开行 -->
                     <el-table-column
                    type="expand">
                    </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column
                    type="index">
                    </el-table-column>
                    <el-table-column prop= "attr_name"
                        label="参数名称">
                    </el-table-column>
                    <el-table-column label="操作">
                    </el-table-column>
                    </el-table>
            </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 点击对话框去 -->
        <el-dialog
        :title="'添加' +titleText"
        :visible.sync="dialogbox"
        width="30%"
        @close='addDialogClosed'
        >
        <el-form :model="addForm" :rules="addFormRules" ref="addFormref" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogbox = false">取 消</el-button>
            <!-- 点击确认后进行表单的验证 -->
            <el-button type="primary" @click="addParms">确 定</el-button>
        </span>
        </el-dialog>
        <!-- 修改 -->
        <el-dialog
        title="修改"
        :visible.sync="dialogVisible"
        width="30%">
        <el-form :model="amendForm" :rules="amendFromrules" ref="amendFromRef" label-width="100px">
        <el-form-item label="修改内容" prop="attr_name">
            <el-input v-model="amendForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="dialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="aditParams">确 定</el-button>
        </span>
</el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            catelist: [],
            selectedCateKeys: [],
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 呗激活的页签的名称
            activeName: 'many',
            // 动态参数
            manyTableData: [],
            // 静态参数
            onlyTableData: [],
            // 点击对话框
            dialogbox: false,
            // 表单数据对象
            addForm: {
                attr_name: ''
            },
            // 表单验证规则
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
            },
            // 修改的对话框
            dialogVisible: false,
            // 表单数据对象
            amendForm: {
            },
            // 表单验证规则
            amendFromrules: {
                 attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
            },
            inputVisible: false,
            inputValue: {}
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
       async getCateList() {
            const {data: res } = await this.$http.get('categories')
            if(res.meta.status !== 200) {
                return this.$message.error('获取失败')
            }
            this.catelist = res.data
            console.log(this.catelist)
        },
        // 级联选择框选中项变化，会触发这个函数
        cateListChange() {
            // 证明选中的不是三级分类
          this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleClick() {
            console.log(this.activeName)
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
              if(this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
            }
            // 证明选中的是三级分类
            console.log(this.selectedCateKeys)
            // 根据所选分类的ID 和当前所处的面板获取对应的参数
           const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, { params: {sel: this.activeName}})
           if(res.meta.status !== 200) {
               return this.$message.error('获取失败 请选择商品分类')
           }
           console.log(res.data)
        //    将获取的数据进行用空格分隔
           res.data.forEach(item => {
               item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            //    控制文本框的显示与隐藏
            item.inputVisible = false
            // 文本框输入的值
            item.inputVisible = ''
           })
           console.log(res.data)
           if(this.activeName === 'many') {
               this.manyTableData = res.data
           }else{
               this.onlyTableData = res.data
           }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            // 清空表单
            this.$refs.addFormref.resetFields()
        },
        // 点击按钮 添加参数
        addParms() {
            // 表单的预验证 结果通过 valid接受
            this.$refs.addFormref.validate(async valid => {
                if(!valid) {
                    return
                }
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    }
                    )
                console.log(res)
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                //   关闭对话框
                this.addForm = false
                // 刷新数据列表
                this.getParamsData = []
                })
        },
        async showdialogVisible(attrId) {
            this.dialogVisible = true
            // 查询当前参数的信息
           const{data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
                params: {attr_sel: this.activeName}
            })
            this.amendForm = res.data
        },
        // 点击按钮修改参数
        aditParams() {
            this.$refs.amendFromRef.validate(async valid => {
                if(!valid) {
                    return
                }
                const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.amendForm.attr_id}`, {
                    attr_name: this.amendForm.attr_name,
                    attr_sel: this.activeName
                })
                this.getParamsData()
                this.dialogVisible = false
            })
        },
        // 根据点击删除按钮
        async removeParams(attrId) {
         const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
            return err
        })
        // // 用户取消了删除操作
        if(confirmResult !== 'confirm') {
            return this.$message.info('已取消删除!')
        }
        // // 删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
        
        if(res.meta.status !== 200) {
            return this.$message.error('删除参数失败')
        }
        // this.$message.success('删除参数成功！')
        },
        // 失去焦点或按下 Enter 都会触发
       async handleInputConfirm(row) {
            console.log(row.inputValue)
         if(row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
        //    如果没有return 则证明输入的内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 需要发起请求，保存这次操作
        this.saveAttrVals(row) 
        },
        // 将对 attr_vals 的操作 保存到数据库
        async saveAttrVals(row) {
            //  console.log(row, '??')
            const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                // // 将数组拼接成字符串
                attr_vals: row.attr_vals.join(' ')
            })
        console.log(row.attr_vals)
        },
        // 点击按钮展示输入文本
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获取得焦点
            // $nextTick 方法的作用 就是当页面上元素重新渲染之后才会指定回调函数的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus()
        })
        },
        // 删除对应的参数
        handleClose(i, row) {
            console.log(i)
            row.attr_vals.splice(i, 1)
            console.log(row, '??')

            this.saveAttrVals(row) 
        }

    },
    computed: {
        // 如果按钮被禁用则返回 true否则返回 false
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        //  当前选中的三级分类的ID
        cateId() {
            if(this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null 
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many') {
                return '动态参数'
            }else{
                return '静态参数'
            }
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 10px 0;
}

</style>
